No pests at all that i have seen. I have have just abiut every pest you can get in the past. This was a new clean setup from seed. I do still ph the water to 6.0, my tap water ph is pretty high after mixing ro tap and nutes ph is 7.0. Last time i checked run off ph it was about 5.8-5.5. There has been no new issues or further dead dry spots. It is only on the tops of 2 plants and they are the tallest. I did have them 2-4 inches from the t5 bulbs which were hot to the touch and have burned tops in the past. Also have some curled leafs to the top near the leafs with the dead spots. Oh yeah also i dont over water for sure in fact i am guilt of u der watering a few ti es this go around, these are some thirsty ladies. I have always cautch it in time when they are droppy and within 20-30 minutes of water they have always perked right back up. I gues it is possible i did a little root damage though if they got too dry....